package io.flutter.plugin.common;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.HashMap;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONObject;

public class JSONUtil {
    private JSONUtil() {
    }
    
    /**
     * Convert the Json java representation to Java objects. Particularly used for converting
     * JSONArray and JSONObject to Lists and Maps.
     */
    public static Object unwrap(Object o) {
        if (JSONObject.NULL.equals(o) || o == null) {
            return null;
        }
        if (o instanceof Boolean
            || o instanceof Byte
            || o instanceof Character
            || o instanceof Double
            || o instanceof Float
            || o instanceof Integer
            || o instanceof Long
            || o instanceof Short
            || o instanceof String) {
            return o;
        }
        try {
            if (o instanceof JSONArray) {
                List<Object> list = new ArrayList<>();
                JSONArray array = (JSONArray) o;
                for (int i = 0; i < array.length(); i++) {
                    list.add(unwrap(array.get(i)));
                }
                return list;
            }
            if (o instanceof JSONObject) {
                Map<String, Object> map = new HashMap<>();
                JSONObject jsonObject = (JSONObject) o;
                Iterator<String> keyIterator = jsonObject.keys();
                while (keyIterator.hasNext()) {
                    String key = keyIterator.next();
                    map.put(key, unwrap(jsonObject.get(key)));
                }
                return map;
            }
        } catch (Exception ignored) {
        }
        return null;
    }

    /**
     * Backport of {@link JSONObject#wrap(Object)} for use on pre-KitKat
     * systems.
     */
    public static Object wrap(Object o) {
        if (o == null) {
            return JSONObject.NULL;
        }
        if (o instanceof JSONArray || o instanceof JSONObject) {
            return o;
        }
        if (o.equals(JSONObject.NULL)) {
            return o;
        }
        try {
            if (o instanceof Collection) {
                JSONArray result = new JSONArray();
                for (Object e : (Collection) o)
                    result.put(wrap(e));
                return result;
            } else if (o.getClass().isArray()) {
                JSONArray result = new JSONArray();
                int length = Array.getLength(o);
                for (int i = 0; i < length; i++)
                    result.put(wrap(Array.get(o, i)));
                return result;
            }
            if (o instanceof Map) {
                JSONObject result = new JSONObject();
                for (Map.Entry<?, ?> entry: ((Map<?, ?>) o).entrySet())
                    result.put((String) entry.getKey(), wrap(entry.getValue()));
                return result;
            }
            if (o instanceof Boolean ||
                o instanceof Byte ||
                o instanceof Character ||
                o instanceof Double ||
                o instanceof Float ||
                o instanceof Integer ||
                o instanceof Long ||
                o instanceof Short ||
                o instanceof String) {
                return o;
            }
            if (o.getClass().getPackage().getName().startsWith("java.")) {
                return o.toString();
            }
        } catch (Exception ignored) {
        }
        return null;
    }
}